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United States Patent | 5,660,774 |
Stangle ,   et al. | August 26, 1997 |
A process for producing a sintered body from untra-fine superconductive particles. In the first step of this process, a ceramic precursor material containing yttrium, barium and copper cations, a nitrogen-containing material, a solvent, and an anion capable of participating in an anionic oxidation-reduction reaction with the nitrogen-containing material, is provided; the nitrogen-containing material contains at least three nitrogen atoms, at least one oxygen atom, and at least one carbon atom. In the second step of the process, droplets of such ceramic precursor material are formed. In the third step of the process, the droplets are dried until particles which contain less than about 15 weight percent of solvent are produced. In the fourth step of this process, such particles are ignited in an atmosphere which contains substantially less than about 60 weight percent of the solvent's saturation value in such atmosphere. A green body is formed from the calcined particles which is subjected to temperature to form a sintered body.
Inventors: | Stangle; Gregory C. (Alfred, NY); Venkatachari; Koththavasal R. (Rochester, NY); Ostrander; Steven P. (Scotia, NY); Schulze; Walter A. (Alfred Station, NY); Pietras; John D. (Alfred Station, NY) |
Assignee: | Alfred University (Alfred, NY) |
Appl. No.: | 495796 |
Filed: | June 27, 1995 |
Current U.S. Class: | 505/425; 264/3.4; 264/6; 423/1; 423/593.1; 501/152; 505/490; 505/500 |
Intern'l Class: | C04B 033/32; C04B 035/622; C01B 013/34 |
Field of Search: | 264/3.4,6,56,65,66,82,125,61 505/450,490,500 501/152 423/23,21.1,155,604,636,593 |
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